When I got it done it involved dumping about 2/3 of the water in my ordinary salt water pool to reduce the amount of sodium chloride, However if you have a fresh water pool then you need not lose any water at all, Throw the required amount of Magnesium and potassium chloride in the pool, set up the new salt chlorinating unit and that's all that there is to it. I will put a link below to a mob in Australia that flogs the stuff so that you can get more information.
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Turn of the chlorinating element and start throwing chlorine in yourself. eventually the salt will come out of the pool as time wears on. or you could just replace the water to get the salt out.